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Long Sleeve Underwear

(237 products)

Products (237)

Sort: Best Match

IcebreakerMerino 200 ZoneKnit Long-Sleeve Half-Zip Thermal Base Layer Top - Women's
$103.73
Save 35%
compared to $160.00
2 reviews with an average rating of 3.5 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
REI OUTLET
ArtilectBoulder 125 Crew Long-Sleeve Base Layer Top - Women's
$75.73
Save 36%
compared to $120.00
1 reviews with an average rating of 1.0 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular
REI OUTLET
Arms of Andes300 Lightweight Alpaca Wool Pullover Base Layer Hoodie - Women's
$140.00
1 reviews with an average rating of 5.0 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular
ArtilectFlatiron 185 Quarter-Zip Base Layer Top - Women's
$99.73
Save 37%
compared to $160.00
0 reviews
Underwear Weight:
Midweight
Size Type:
Regular
REI OUTLET
IcebreakerMerino 200 Oasis Long-Sleeve Crewe Macro Forms Base Layer Top - Women's
$85.73
Save 25%
compared to $115.00
3 reviews with an average rating of 3.7 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
REI OUTLET
SmartwoolClassic Thermal Merino Mock Neck Base Layer Top - Women's
$140.00
0 reviews
Underwear Weight:
Midweight
Size Type:
Regular
New arrival
Kari TraaEloise Long-Sleeve Base Layer Top - Women's
$52.73
Save 24%
compared to $70.00
0 reviews
Underwear Weight:
Lightweight
Size Type:
Regular
REI OUTLET
New arrival
Kari TraaMalia Half-Zip Base Layer Top - Women's
$59.73
Save 25%
compared to $80.00
0 reviews
Underwear Weight:
Midweight
Size Type:
Regular, Plus
REI OUTLET
SmartwoolIntraknit Thermal Max Merino Quarter-Zip Base Layer Top - Men's
$155.00
0 reviews
Underwear Weight:
Midweight
Size Type:
Regular, Big
Top Rated
IcebreakerMerino 260 Tech Long-Sleeve Turtleneck Base Layer - Men's
$135.00
8 reviews with an average rating of 4.6 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Big
IcebreakerMerino Long-Sleeve Roll-Neck Base Layer Top - Women's
$220.00
2 reviews with an average rating of 5.0 out of 5 stars
Underwear Weight:
Heavyweight
Size Type:
Regular
New arrival
Kari TraaEloise Half-Zip Base Layer Top - Women's
$59.73
Save 25%
compared to $80.00
0 reviews
Underwear Weight:
Lightweight
Size Type:
Regular
REI OUTLET
Kari TraaLune Long-Sleeve Base Layer Top - Women's
$41.73
Save 35%
compared to $65.00
2 reviews with an average rating of 3.0 out of 5 stars
Underwear Weight:
Heavyweight
Size Type:
Regular
REI OUTLET
SmartwoolClassic Thermal Merino Base Layer Crew One-Piece - Women's
$250.00
0 reviews
Underwear Weight:
Midweight
Size Type:
Regular
Helly HansenLIFA Merino Midweight Graphic Base Layer Crew Top - Women's
$110.00
1 reviews with an average rating of 5.0 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
KUHLReactiv Lite Grid Quarter-Zip Base Layer Top - Women's
$119.00
0 reviews
Underwear Weight:
Lightweight
Size Type:
Regular
Kari TraaEdith Half-Zip Base Layer Top - Women's
$82.73
Save 24%
compared to $110.00
1 reviews with an average rating of 1.0 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
REI OUTLET
Top Rated
Helly HansenLifa Merino Midweight Half-Zip Base Layer Top - Men's
$110.00 - $115.00
5 reviews with an average rating of 4.8 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
SmartwoolIntraknit Thermal Merino Colorblock Crew Base Layer Top - Men's
$130.00
11 reviews with an average rating of 4.4 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
The North FaceFD Pro 160 Base Layer Crew Top - Women's
$70.00
50 reviews with an average rating of 4.4 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
Helly HansenLIFA Merino Midweight Balaclava Base Layer Hoodie - Women's
$150.00
0 reviews
Underwear Weight:
Midweight
Size Type:
Regular
Helly HansenHH LIFA Base Layer Set - Kids'
$70.00
1 reviews with an average rating of 1.0 out of 5 stars
Underwear Weight:
Ultralightweight
Size Type:
Regular
Outdoor ResearchAlpine Onset Merino 150 Half-Zip Base Layer Top - Women's
$109.00
3 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Plus
New arrival
Outdoor ResearchAlpine Onset Merino 150 Quarter-Zip Base Layer Top - Men's
$109.00
1 reviews with an average rating of 5.0 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
Icebreaker200 ZoneKnit Long-Sleeve Crewe Base Layer Top - Men's
$150.00
0 reviews
Underwear Weight:
Midweight
Size Type:
Regular, Plus
New arrival
Ortovox185 Rock'N'Wool Long-Sleeve Base Layer Top - Men's
$120.00 - $130.00
0 reviews
Underwear Weight:
Lightweight
Size Type:
Regular, Big
New arrival
Ortovox185 Rock'N'Wool Zip Neck Base Layer Top - Men's
$130.00
0 reviews
Underwear Weight:
Lightweight
Size Type:
Regular, Big
KUHLReactiv Lite Grid Long-Sleeve Crew Base Layer Top - Men's
$109.00
0 reviews
Underwear Weight:
Lightweight
Size Type:
Regular, Big
Outdoor ResearchAlpine Onset Merino 150 Crew Base Layer Top - Women's
$99.00
2 reviews with an average rating of 5.0 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Plus
Helly HansenHH Durawool Crew Long-Sleeve Base Layer - Women's
$90.00
0 reviews
Underwear Weight:
Lightweight
Size Type:
Regular

181–210 of 237 products

Sort: Best Match

Related Expert Advice articles

What material is best?

Wool is moisture-wicking and odor-resistant, while synthetic fabrics are more durable and less expensive.

Match the temp to the trek

Lightweight layers are best for moderate to cool temperatures. Midweight layers are best for cold temperatures. Heavyweight layers are best for below-freezing temperatures.

Find your fit

To be able to wick sweat efficiently, your next-to-skin layer needs to actually be next to your skin. A comfortably snug fit everywhere is your goal.

Read full article: How to Choose Base Layers

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